If polar covalent bonding results in a molecule with a positively-charged end and a negatively-charged end, the molecule is call
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42.34 g of water could be warmed from 21.4°C to 43.4°C by the pellet dropped inside it
Heat loss by the pellet is equal to the Heat gained by the water.
….(1)
where, is the heat gained by water
is the heat loss by pellet
= mCΔT
where m = mass of water
C = specific heat capacity of water = 4.184 J/g-°C
ΔT = Increase in temperature
ΔT for water = 43.4 - 21.4 = 22°C
= m × 4.184 × 22 …. (2)
Now
=
×ΔT
where = Heat capacity of pellet = 56J/°C
Δ T for pellet = 43.4 - 113 =- 69.6°C
= 56 × -69.6 = -3897.6 J
From equation (1) and (2)
-m× 4.184 × 22 =-3897.6
m= 42.34 g
Hence, 42.34 g of water could be warmed from 21.4 degrees Celsius to 43.4 degrees Celsius by the pellet dropped inside it.
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(doesn't really matter that it's zinc :) )
It is
, where 
(in some books 6.022).
It is
Explanation:
The given data is as follows.
Thickness = 0.28 mm = cm = 0.028 cm
Area = 0.40 =
= 4000
As, it is known that volume = area × thickness
So, Volume =
= 112
As density is mass divided by volume. So, mass of chromium will be calculated as follows.
Density =
7.20 =
mass = 806.4 g
As, mass of 1 mole of chromium is 52 g. So, number of moles in 806.4 g of chromium will be as follows.
No. of moles =
=
= 15.50 mol
In chromate ion, () charge on Cr is +6. It means that 6 electrons are needed to reduce
into Cr.
As, 1 mole of ions require 6 moles of electrons. Therefore, moles of electrons for 15.50 mol will be calculated as follows.
6 × 15.50 mol = 93.04 mol
To calculate number of electrons we multiply number of moles by Avogadro's number as follows.
=
= electrons
There is magnitude of times the charge on an electron is equal to 1 coulomb.
Hence, number of coulombs will be as follows.
No. of coulombs =
= C
or, = C
Thus, we can conclude that C are required to plate a layer of chromium metal with given data.